/**
 * Copyright (c) 2012-2017, www.tinygroup.org (luo_guo@icloud.com).
 * <p>
 * Licensed under the GPL, Version 3.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.gnu.org/licenses/gpl.html
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.tinygroup.docgen.util;

import com.thoughtworks.xstream.core.util.Base64Encoder;
import org.tinygroup.commons.io.StreamUtil;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

public class ImageUtil {

    private ImageUtil() {
    }

    public static String streamToBase64(InputStream inputStream)
            throws Exception {
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        StreamUtil.io(inputStream, byteArrayOutputStream, true, false);
        return new Base64Encoder().encode(byteArrayOutputStream.toByteArray());
    }

    public static String fileToBase64(String fileName) throws Exception {
        return fileToBase64(new File(fileName));
    }

    public static String fileToBase64(File file) throws Exception {
        InputStream inputStream = new FileInputStream(file);
        return streamToBase64(inputStream);
    }

}
